Which retail innovation, introduced in the 1910s, revolutionized shopping by allowing customers to select their own products without clerk assistance for the first time?

The retail landscape we know today evolved through centuries of innovation. From ancient marketplaces to modern malls, retail history reveals fascinating insights into commerce, culture, and consumer behavior. This trivia question explores a pivotal moment in retail history that fundamentally changed how consumers shop and how products are marketed - a revolution that continues to influence retail strategies even in our digital age.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department stores with multiple product categories (introduced by Bon Marché in 1852)
Mail-order catalogs with home delivery (popularized by Montgomery Ward in 1872)
Shopping malls with multiple stores under one roof (developed by Southdale Center in 1956)